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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>6.2 Connectors</TITLE><META NAME="description" CONTENT="6.2 Connectors"><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="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html"><LINK REL="previous" HREF="node58.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node58.html"><LINK REL="up" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html"><LINK REL="next" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html2243" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html2237" 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="tex2html2231" HREF="node60.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node60.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html2239" 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="tex2html2241" 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="tex2html2244" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html">6.3 Object hierarchy</A><B> Up:</B> <A NAME="tex2html2238" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html">6. Links: Simple Links</A><B> Previous:</B> <A NAME="tex2html2232" HREF="node60.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node60.html">6.1.0.0.2 SimpleLink Procedures</A>   <B> <A NAME="tex2html2240" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html2242" 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="SECTION03320000000000000000"></A><A NAME="sec:links:connectors"></A><BR>6.2 Connectors</H1><P>Connectors, unlink classifiers, only generate data for one recipient;either the packet is delivered to the <TT>target_</TT> neighbor, or itis sent to he <TT>drop-target_</TT>.<P>A connector will receive a packet, perform some function,and deliver the packet to its neighbor, or drop the packet.There are a number of different types of connectors in .Each connector performs a different function.<P><TABLE CELLPADDING=3 WIDTH="100%"><TR><TD ALIGN="RIGHT">networkinterface</TD><TD ALIGN="LEFT">labels packets with incoming interface identifier--it is used by some multicast routing protocols. The class variable ``Simulator NumberInterfaces_ 1'' tells to add these interfaces, and then, it is added to either end of the simplex link. Multicast routing protocols are discussed in a separate chapterChapterchap:multicast.</TD></TR><TR><TD ALIGN="RIGHT">DynaLink</TD><TD ALIGN="LEFT">Object that gates traffic depending on whether the link is up or down. It expects to be at the head of the link, and is inserted on the link just prior to simulation start. It's <TT>status<BR>_</TT> variable control whether the link is up or down. The description of how the DynaLink object is used is in a separate chapterChapterchap:net-dynamics.</TD></TR><TR><TD ALIGN="RIGHT">DelayLink</TD><TD ALIGN="LEFT">Object that models the link's delay and bandwidth characteristics. If the link is not dynamic, then this object simply schedules receive events for the downstream object for each packet it receives at the appropriate time for that packet. However, if the link is dynamic, then it queues the packets internally, and schedules one receives event for itself for the next packet that must be delivered. Thus, if the link goes down at some point, this object's []reset method../ns-2/delay.ccDelayLink::reset is invoked, and the object will drop all packets in transit at the instant of link failure. We discuss the specifics of this class in another chapterChapterchap:delays.</TD></TR><TR><TD ALIGN="RIGHT">Queues</TD><TD ALIGN="LEFT">model the output buffers attached to a link in a ``real'' router in a network. In , they are attached to, and are considered as part of the link. We discuss the details of queues and different types of queues in in another chapterChapterchap:qmgmt.</TD></TR><TR><TD ALIGN="RIGHT">TTLChecker</TD><TD ALIGN="LEFT">will decrement the ttl in each packet that it receives. If that ttl then has a positive value, the packet is forwarded to the next element on the link. In the simple links, TTLCheckers are automatically added, and are placed as the last element on the link, between the delay element, and the entry for the next node.</TD></TR></TABLE><P><HR><!--Navigation Panel--><A NAME="tex2html2243" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html2237" 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="tex2html2231" HREF="node60.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node60.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html2239" 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="tex2html2241" 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="tex2html2244" HREF="node62.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node62.html">6.3 Object hierarchy</A><B> Up:</B> <A NAME="tex2html2238" HREF="node57.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node57.html">6. Links: Simple Links</A><B> Previous:</B> <A NAME="tex2html2232" HREF="node60.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node60.html">6.1.0.0.2 SimpleLink Procedures</A>   <B> <A NAME="tex2html2240" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html2242" 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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