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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>6.4 Commands at a glance</TITLE><META NAME="description" CONTENT="6.4 Commands at a glance"><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="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html"><LINK REL="up" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html"><LINK REL="next" HREF="node64.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node64.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html2269" HREF="node64.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node64.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html2263" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html2259" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html2265" 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="tex2html2267" 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="tex2html2270" HREF="node64.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node64.html">7. Queue Management and</A><B> Up:</B> <A NAME="tex2html2264" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html">6. Links: Simple Links</A><B> Previous:</B> <A NAME="tex2html2260" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html">6.3 Object hierarchy</A>   <B> <A NAME="tex2html2266" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html2268" 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="SECTION03340000000000000000"></A><A NAME="sec:linkscommand"></A><BR>6.4 Commands at a glance</H1><P>Following is a list of common link commands used in simulation scripts:<DIV ALIGN="LEFT"></DIV><P><DIV ALIGN="LEFT"><TT>$ns_ simplex-link node1 node2 bw delay qtype args</TT><BR>This command creates an unidirectional link between node1 and node2 withspecified bandwidth (BW) and delay characteristics. The link uses a queuetype of <qtype> and depending on the queue type different arguments arepassed through <args>.</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ duplex-link node1 node2 bw delay qtype args</TT><BR>This creates a bi-directional link between node1 and node2. This procedureessentially creates a duplex-link from two simplex links, one from node1to node2 and the other from node2 to node1. The syntax for duplex-link issame as that of simplex-link described above.</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ duplex-intserv-link n1 n2 bw dly sched signal adc args</TT><BR>This creates a duplex-link between n1 and n2 with queue type of intserv, withspecified BW and delay. This type of queue implements a scheduler with twolevel services priority. The type of intserv queue is given by <sched>, withadmission control unit type of <adc> and signal module of type <signal>.</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ simplex-link-op n1 n2 op args</TT><BR>This is used to set attributes for a simplex link. The attributes may bethe orientation, color, label, or queue-position.</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ duplex-link-op n1 n2 op args</TT><BR>This command is used to set link attributes (like orientation of the links,color, label, or queue-position) for duplex links.</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ link-lossmodel lossobj from to</TT><BR>This function generates losses (using the loss model <lossobj> inserted inthe link between <from> node and <to> node) in the link that can bevisualized by nam.</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ lossmodel lossobj from to</TT><BR>This is used to insert a loss module in regular links.</DIV><P><DIV ALIGN="LEFT">Following is a list of internal link-related procedures:</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ register-nam-linkconfig link</TT><BR>This is an internal procedure used by <TT>"$link orient"</TT> to register/update the order in which links should be created in nam.</DIV><P><DIV ALIGN="LEFT"><TT>$ns_ remove-nam-linkconfig id1 id2</TT><BR>This procedure is used to remove any duplicate links (duplicate links may becreated by GT-ITM topology generator).</DIV><P><DIV ALIGN="LEFT"><TT>$link head</TT><BR>Returns the instance variable <TT>head_</TT> for the link. The <TT>head_</TT> isthe entry pont to the link and it points to the first object in the link.</DIV><P><DIV ALIGN="LEFT"><TT>$link add-to-head connector</TT><BR>This allows the <connector> object to be now pointed by the <TT>head_</TT>element in the link, i.e, <connector> now becomes the first object in thelink.</DIV><P><DIV ALIGN="LEFT"><TT>$link link</TT><BR>Returns the instance variable <TT>link_</TT>. The <TT>link_</TT> is the elementin the link that actually models the link in terms of delay and bandwidthcharacteristics of the link.</DIV><P><DIV ALIGN="LEFT"><TT>$link queue</TT><BR>Returns the instance variable <TT>queue_</TT>. <TT>queue_</TT> is queue elementin the link. There may be one or more queue elements in a particular link.</DIV><P><DIV ALIGN="LEFT"><TT>$link cost c</TT><BR>This sets a link cost of <c>.</DIV><P><DIV ALIGN="LEFT"><TT>$link cost?</TT><BR>Returns the cost value for the link. Default cost of link is set to 1.</DIV><P><DIV ALIGN="LEFT"><TT>$link if-label?</TT><BR>Returns the network interfaces associated with the link (for multicast routing).</DIV><P><DIV ALIGN="LEFT"><TT>$link up</TT><BR>This sets the link status to "up". This command is a part of networkdynamics support in .</DIV><P><DIV ALIGN="LEFT"><TT>$link down</TT><BR>Similar to up, this command marks the link status as "down".</DIV><P><DIV ALIGN="LEFT"><TT>$link up?</TT><BR>Returns the link status. The status is always "up" as default, if linkdynamics is not enabled.</DIV><P><DIV ALIGN="LEFT"><TT>$link all-connectors op</TT><BR>This command applies the specified operation <op> to all connectors in thelink. Like, <TT>$link all-connectors reset</TT> or<TT>$link all-connectors isDynamic</TT>. </DIV><P><DIV ALIGN="LEFT"><TT>$link install-error errmodel</TT><BR>This installs an error module after the <TT>link_</TT> element.</DIV><P><DIV ALIGN="LEFT">In addition to the Link and link-related commands listed above, there areother procedures to support the specific requirements of different types oflinks derived from the base class "Link" like simple-link (SimpleLink),integrated service (IntServLink), class-based queue (CBQLink), fair queue(FQLink) and procedures to support multicast routing, sessionsim, nam etc.These and the above procedures may be found in /tcl/lib(ns-lib.tcl,ns-link.tcl, ns-intserv.tcl, ns-namsupp.tcl, ns-queue.tcl),/tcl/mcast/(McastMonitor.tcl, ns-mcast.tcl), /tcl/session/session.tcl.</DIV><P><DIV ALIGN="LEFT"></DIV><HR><!--Navigation Panel--><A NAME="tex2html2269" HREF="node64.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node64.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html2263" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html2259" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html2265" 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="tex2html2267" 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="tex2html2270" HREF="node64.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node64.html">7. Queue Management and</A><B> Up:</B> <A NAME="tex2html2264" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html">6. Links: Simple Links</A><B> Previous:</B> <A NAME="tex2html2260" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html">6.3 Object hierarchy</A>   <B> <A NAME="tex2html2266" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html2268" 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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