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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>23.5 Packet Types</TITLE><META NAME="description" CONTENT="23.5 Packet Types"><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="node272.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node272.html"><LINK REL="previous" HREF="node270.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node270.html"><LINK REL="up" HREF="node265.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node265.html"><LINK REL="next" HREF="node272.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node272.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html5457" HREF="node272.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node272.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5451" HREF="node265.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node265.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html5445" HREF="node270.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node270.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html5453" 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="tex2html5455" 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="tex2html5458" HREF="node272.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node272.html">23.6 Queue Monitoring</A><B> Up:</B> <A NAME="tex2html5452" HREF="node265.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node265.html">23. Trace and Monitoring</A><B> Previous:</B> <A NAME="tex2html5446" HREF="node270.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node270.html">23.4 Trace File Format</A>   <B> <A NAME="tex2html5454" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5456" 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="SECTION04350000000000000000"></A><A NAME="sec:traceptype"></A><BR>23.5 Packet Types</H1><P>Each packet contains a packet type field used by <TT>Trace::format</TT>to print out the type of packet encountered.The type field is defined in the <TT>TraceHeader</TT> class, and is consideredto be part of the trace support; it is not interpretedelsewhere in the simulator.Initialization of the type field in packets is performed by theAgent::allocpkt method.The type field is set to integer values associated with thedefinition passed tothe <TT>Agent</TT> constructor (Section <A HREF="node116.html#sec:agents:exlinkage" tppabs="http://www.isi.edu/nsnam/ns/doc/node116.html#sec:agents:exlinkage">10.6.3</A>).The currently-supported definitions, their values, and theirassociated symblic names are as follows(defined in packet.h):<PRE>enum packet_t { PT_TCP, PT_UDP, PT_CBR, PT_AUDIO, PT_VIDEO, PT_ACK, PT_START, PT_STOP, PT_PRUNE, PT_GRAFT, PT_GRAFTACK, PT_JOIN, PT_ASSERT, PT_MESSAGE, PT_RTCP, PT_RTP, PT_RTPROTO_DV, PT_CtrMcast_Encap, PT_CtrMcast_Decap, PT_SRM, /* simple signalling messages */ PT_REQUEST, PT_ACCEPT, PT_CONFIRM, PT_TEARDOWN, PT_LIVE, // packet from live network PT_REJECT, PT_TELNET, // not needed: telnet use TCP PT_FTP, PT_PARETO, PT_EXP, PT_INVAL, PT_HTTP, /* new encapsulator */ PT_ENCAPSULATED, PT_MFTP, /* CMU/Monarch's extnsions */ PT_ARP, PT_MAC, PT_TORA, PT_DSR, PT_AODV, // insert new packet types here PT_NTYPE // This MUST be the LAST one};</PRE>The constructor of class <TT>p_info</TT> glues these constants withtheir string values:<PRE> p_info() { name_[PT_TCP]= "tcp"; name_[PT_UDP]= "udp"; name_[PT_CBR]= "cbr"; name_[PT_AUDIO]= "audio"; ... name_[PT_NTYPE]= "undefined"; }</PRE>See also section <A HREF="node133.html#sec:pinfoclass" tppabs="http://www.isi.edu/nsnam/ns/doc/node133.html#sec:pinfoclass">12.2.2</A> for more details.<P><BR><HR><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>⌨️ 快捷键说明
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