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