64 lines
3.8 KiB
HTML
64 lines
3.8 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Server-to-client Broadcast Data Packets" />
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<meta name="abstract" content="This information explains the fields in a Broadcast Data (BDATA) Packet in detail." />
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<meta name="description" content="This information explains the fields in a Broadcast Data (BDATA) Packet in detail." />
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<meta name="DC.Relation" scheme="URI" content="rzal5tftpsub.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2000, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="bdata" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Server-to-client Broadcast Data Packets</title>
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</head>
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<body id="bdata"><a name="bdata"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Server-to-client Broadcast Data Packets</h1>
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<div><p>This information explains the fields in a Broadcast Data (BDATA)
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Packet in detail.</p>
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<div class="section"><dl><dt class="dlterm"><strong>block#</strong></dt>
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<dd>2–byte binary number in the network byte order that indicates the number
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of a particular block of data.</dd>
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<dt class="dlterm"><strong>sbid</strong></dt>
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<dd>4–byte binary number in the network byte order that is called the <em>subnet
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broadcast identification</em>. This must be compared with the <tt>sbid</tt> that
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was returned in the OACK response to a read request (RRQ) with the Subnet
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Broadcast option. Along with the source port, this uniquely identifies a Subnet
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Broadcast File Transfer. The source port of the BDATA packet must be compared
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with the source port of the initial OACK packet that was received for this
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transfer. Only BDATA packets that match on both the SBID and source ports
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are considered part of the requested transfer. All other BDATA packets must
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be ignored.</dd>
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<dt class="dlterm"><strong>data</strong></dt>
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<dd>This is the data for this block of the file transfer. With the exception
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of the last block of the file, the size of the data is equal to the block
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size for the transfer. The last block of the file must be less than the block
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size, even if it means that the length of the data in the last block is zero.
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However, the server might not be done broadcasting blocks after the last block
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of the file is broadcast. Control can be transferred to another client in
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the subnet broadcast file group that has not yet received all the blocks in
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the file.</dd>
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</dl>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzal5tftpsub.htm" title="Broadcast storms are a performance problem that might occur when there are large numbers of systems that boot from the network.">TFTP Subnet Broadcast option</a></div>
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</div>
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</div>
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</body>
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</html>
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