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tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5501" 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="SECTION04371000000000000000"></A><A NAME="sec:flowmonitor"></A><BR>23.7.1 The Flow Monitor</H2><P>The <TT>QueueMonitor/ED/Flowmon</TT> class is responsible for managingthe creation of new flow objects when packets arrive on previouslyunknown flows and for updating existing flow objects.Because it is a subclass of <TT>QueueMonitor</TT>, each flow monitorcontains an aggregate count of packet and byte arrivals, departures, anddrops.Thus, it is not necessary to create a separate queue monitor to recordaggregate statistics.It provides the following OTcl interface:<BLOCKQUOTE><TABLE CELLPADDING=3 WIDTH="100%"><TR><TD ALIGN="RIGHT">classifier</TD><TD ALIGN="LEFT">get(set) classifier to map packets to flows</TD></TR><TR><TD ALIGN="RIGHT">attach</TD><TD ALIGN="LEFT">attach a Tcl I/O channel to this monitor</TD></TR><TR><TD ALIGN="RIGHT">dump</TD><TD ALIGN="LEFT">dump contents of flow monitor to Tcl channel</TD></TR><TR><TD ALIGN="RIGHT">flows</TD><TD ALIGN="LEFT">return string of flow object names known to this monitor</TD></TR></TABLE></BLOCKQUOTE><P>The <TT>classifier</TT> function sets or gets the name of the previously-allocatedobject which will perform packet-to-flow mapping for the flow monitor.Typically, the type of classifier used will have to do with the notion of``flow'' held by the user.One of the hash based classifiers that inspect various IP-level headerfields is typically used here (e.g. fid, src/dst, src/dst/fid).Note that while classifiers usually receive packets and forward themon to downstream objects, the flow monitor uses the classifier only forits packet mapping capability, so the flow monitor acts as a passivemonitor only and does not actively forward packets.<P>The <TT>attach</TT> and <TT>dump</TT> functions are used toassociate a Tcl I/O stream with theflow monitor, and dump its contents on-demand.The file format used by the <TT>dump</TT> command is described below.<P>The <TT>flows</TT> function returns a list of the names of flows knownby the flow monitor in a way understandable to Tcl.This allows tcl code to interrogate a flow monitor in orderto obtain handles to the individual flows it maintains.<P><HR><!--Navigation Panel--><A NAME="tex2html5502" HREF="node275.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node275.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5496" HREF="node273.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node273.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html5490" HREF="node273.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node273.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" 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tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5501" 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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