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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>32.2.3 MultipleFastRtx SCTP</TITLE><META NAME="description" CONTENT="32.2.3 MultipleFastRtx SCTP"><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="node421.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node421.html"><LINK REL="previous" HREF="node419.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node419.html"><LINK REL="up" HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html"><LINK REL="next" HREF="node421.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node421.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html7841" HREF="node421.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node421.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html7835" HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html7829" HREF="node419.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node419.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html7837" 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="tex2html7839" 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="tex2html7842" HREF="node421.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node421.html">32.2.4 Timestamp SCTP</A><B> Up:</B> <A NAME="tex2html7836" HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html">32.2 Extensions</A><B> Previous:</B> <A NAME="tex2html7830" HREF="node419.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node419.html">32.2.2 HbAfterRto SCTP</A>   <B> <A NAME="tex2html7838" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html7840" 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="SECTION06323000000000000000">32.2.3 MultipleFastRtx SCTP</A></H2><P>The MultipleFastRtx SCTP agent attempts to minimize the number of timeouts which occur. Without the Multiple Fast Retransmit algorithm, SCTP may only Fast Retransmit a TSN once. If a Fast Retransmitted TSN is lost, a timeout is necessary to retransmit the TSN again. The Multiple Fast Retransmit algorithm allows the same TSN to be Fast Retransmitted several times if needed. Without the Multiple Fast Retransmit algorithm, a large window of outstanding data may generate enough SACKs to incorrectly trigger more than one Fast Retransmit of the same TSN in a single RTT. To avoid these spurious Fast Retransmits, the Multiple Fast Retransmit algorithm introduces a <EM> fastRtxRecover</EM> state variable for each TSN Fast Retransmitted. This variable stores the highest outstanding TSN at the time a TSN is Fast Retransmitted. Then, only SACKs which newly ack TSNs beyond <EM>fastRtxRecover</EM> can increment the missing report for the Fast Retransmitted TSN. If the missing report threshold for the Fast Retransmitted TSN is reached again, the sender has enough evidence that this TSN was lost and can be Fast Retransmitted again [<A HREF="node589.html#SCTP_CARO_2003e" tppabs="http://www.isi.edu/nsnam/ns/doc/node589.html#SCTP_CARO_2003e">8</A>].<P><HR><!--Navigation Panel--><A NAME="tex2html7841" HREF="node421.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node421.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html7835" HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html7829" HREF="node419.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node419.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html7837" 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="tex2html7839" 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="tex2html7842" HREF="node421.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node421.html">32.2.4 Timestamp SCTP</A><B> Up:</B> <A NAME="tex2html7836" HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html">32.2 Extensions</A><B> Previous:</B> <A NAME="tex2html7830" HREF="node419.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node419.html">32.2.2 HbAfterRto SCTP</A>   <B> <A NAME="tex2html7838" HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>   <B> <A NAME="tex2html7840" 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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