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tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5873" HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H4><A NAME="SECTION05130030000000000000">26.3.0.0.3 DV Routing</A></H4>DV routing is the implementation ofDistributed Bellman-Ford (or Distance Vector) routing in .The implementation sends periodic route updates every <TT>advertInterval</TT>.This variable is a class variable in the Agent/rtProto/DV../ns-2/tcl/rtglib/route-proto.tcl.Its default value is 2 seconds.<P>In addition to periodic updates, each agent also sends triggered updates;it does this whenever the forwarding tables in the node change.This occurs either due to changes in the topology, or because an agent at the node received a route update,and recomputed and installed new routes.<P>Each agent employs the split horizon with poisoned reverse mechanismsto advertise its routes to adjacent peers.``Split horizon'' is the mechanism by which an agent will not advertisethe route to a destination out of the interface that it is using toreach that destination.In a ``Split horizon with poisoned reverse'' mechanism,the agent will advertise that route out of that interface with a metric of infinity.<P>Each DV agent uses a default <TT>preference_</TT> of 120.The value is determined by the class variable of the same name.<P>Each agent uses the class variable <TT>INFINITY</TT> (set at 32)to determine the validity of a route.<P><HR><!--Navigation Panel--><A NAME="tex2html5874" HREF="node297.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node297.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html5868" HREF="node293.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node293.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html5862" 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tppabs="http://www.isi.edu/nsnam/ns/doc/node295.html">26.3.0.0.2 Session Routing</A>   <B> <A NAME="tex2html5871" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html5873" 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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