node419.html

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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>32.2.2 HbAfterRto SCTP</TITLE><META NAME="description" CONTENT="32.2.2 HbAfterRto 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="node420.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node420.html"><LINK REL="previous" HREF="node418.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node418.html"><LINK REL="up" HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html"><LINK REL="next" HREF="node420.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node420.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html7827"  HREF="node420.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node420.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html7821"  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="tex2html7815"  HREF="node418.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node418.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html7823"  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="tex2html7825"  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="tex2html7828"  HREF="node420.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node420.html">32.2.3 MultipleFastRtx SCTP</A><B> Up:</B> <A NAME="tex2html7822"  HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html">32.2 Extensions</A><B> Previous:</B> <A NAME="tex2html7816"  HREF="node418.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node418.html">32.2.1 Newreno SCTP</A> &nbsp <B>  <A NAME="tex2html7824"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>  &nbsp <B>  <A NAME="tex2html7826"  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="SECTION06322000000000000000">32.2.2 HbAfterRto SCTP</A></H2><P>The HbAfterRto SCTP agent extends the current retransmission	 policy. In addition to SCTP's current policy of retransmitting to	 an alternate destination on a timeout, a heartbeat is sent	 immediately to the destination on which a timeout occurred. Extra	 heartbeats provide a mechanism for a sender to update an	 alternate destination's RTT estimate more frequently, thus	 resulting in a better RTT estimate on which to base the RTO	 value.<P>For example, suppose a packet is lost in transit to the primary	 destination, and later gets retransmitted to an alternate	 destination. Also suppose that the retransmission times out. The	 lost packet is retransmitted again to yet another alternate	 destination (if one exists; otherwise, the primary). More	 importantly, a heartbeat is also sent to the alternate	 destination which timed out. If the heartbeat is successfully	 acked, that destination acquires an additional RTT measurement to	 help reduce its recently doubled RTO&nbsp;[<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="tex2html7827"  HREF="node420.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node420.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html7821"  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="tex2html7815"  HREF="node418.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node418.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html7823"  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="tex2html7825"  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="tex2html7828"  HREF="node420.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node420.html">32.2.3 MultipleFastRtx SCTP</A><B> Up:</B> <A NAME="tex2html7822"  HREF="node417.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node417.html">32.2 Extensions</A><B> Previous:</B> <A NAME="tex2html7816"  HREF="node418.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node418.html">32.2.1 Newreno SCTP</A> &nbsp <B>  <A NAME="tex2html7824"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>  &nbsp <B>  <A NAME="tex2html7826"  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>

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