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tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8274" 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="SECTION06450020000000000000">33.5.0.0.2 Repair Mechanisms</A></H4>The agent will initiate a repair if it receives a request for a packet,and it does not have a request object <TT>pending_</TT> for that packet.The default repair object belongs to theSRM/repair../ns-2/srm.tcl.Barring minor differences,the sequence of events and the instance procedures in this classare identical to those for SRM/request.Rather than outline every single procedure, we only outlinethe differences from those described earlier for a request object.<P>The repair object uses the repair parameters, <TT>D1_</TT>, <TT>D2_</TT>.A repair object does not repeatedly reschedule is timers;therefore, it does not use any of the backoff variablessuch as that used by a request object.The repair object ignores all requests for the same packet.The repair objet does not use the <TT>ignore_</TT> variable thatrequest objects use.The trace entries written by repair objects are marginally different;they are ``<SMALL>P NACK </SMALL> from requester'',``<SMALL>P RTIMER </SMALL> at fireTime'',``<SMALL>P SENDREP</SMALL>'', ``<SMALL>P REPAIR IGNORES </SMALL> holddown''.<P>Apart from these differences,the calling sequence for events in a repair object is similar to thatof a request object.<P><HR><!--Navigation Panel--><A NAME="tex2html8275" HREF="node449.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node449.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html8269" HREF="node446.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node446.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html8263" HREF="node447.html" 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tppabs="http://www.isi.edu/nsnam/ns/doc/node447.html">33.5.0.0.1 Request Mechanisms</A>   <B> <A NAME="tex2html8272" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html8274" 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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