85 lines
5.4 KiB
HTML
85 lines
5.4 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="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="concept" />
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<meta name="DC.Title" content="Understand the token-ring address format" />
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<meta name="abstract" content="While troubleshooting, you might need to view the information of the destination-address and source-address frames." />
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<meta name="description" content="While troubleshooting, you might need to view the information of the destination-address and source-address frames." />
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<meta name="DC.Relation" scheme="URI" content="rzajutroubleshootingtokenring.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="token-ring_address_format" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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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>Understand the token-ring address format</title>
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</head>
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<body id="token-ring_address_format"><a name="token-ring_address_format"><!-- --></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">Understand the token-ring address format</h1>
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<div><p>While troubleshooting, you might need to view the
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information of the destination-address and source-address frames.</p>
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<p>These are the formats of the frames:</p>
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<p><strong>Destination address format:</strong></p>
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<p>This figure shows the destination address format:</p>
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<div class="fignone" id="token-ring_address_format__destination_address_format_fig"><a name="token-ring_address_format__destination_address_format_fig"><!-- --></a><span class="figcap">Figure 1. Destination address format</span><br /><img src="rsln739.gif" alt="Destination address format" /><br /></div>
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<p>Some of the bits indicate the characteristics of the destination address:</p>
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<ul><li><strong>I/G bit (bit 0 of byte 0)</strong> indicates the type (individual or group)
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of the destination address. These are the possible values for this bit: <ul><li>0: The destination address is an individual address (an address that is
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associated with a device on the network).</li>
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<li>1: The destination address is a group address (a multiple destination
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address that is associated with one or more devices on the network).</li>
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</ul>
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</li>
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<li><strong>U/L bit (bit 1 of byte 0)</strong> indicates who defined the address. These
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are the possible values for this bit: <ul><li>0: The manufacture defined the address (it is a universally administered
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address or in other words a burned-in address).</li>
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<li>1: The administrator defined the address (it is a locally administered
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address).</li>
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</ul>
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</li>
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<li><strong>Functional address indicator (FAI) bit (bit 0 of byte 2)</strong> indicates
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the address type of the locally administered address. These are the possible
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values for this bit: <ul><li>0: The address is a functional address.</li>
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<li>1: The address is a group address.</li>
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</ul>
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</li>
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</ul>
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<p><strong>Source address format:</strong></p>
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<p>A source address is always an individual address (that is, an address that
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is associated with a device on the network). This figure shows the format
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of the address:</p>
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<div class="fignone" id="token-ring_address_format__source_address_format_fig"><a name="token-ring_address_format__source_address_format_fig"><!-- --></a><span class="figcap">Figure 2. Source address format</span><br /><img src="rv2l000.gif" alt="Source address format" /><br /></div>
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<p>Some of the bits indicate the type of address that the source address contains:</p>
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<ul><li><strong>Bit 0 of byte 0</strong> indicates whether or not the frame contains a routing
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information field. These are the possible values for this bit: <ul><li>0: The routing information field is present.</li>
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<li>1: The routing information field is not present.</li>
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</ul>
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</li>
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<li><strong>Bit 1 of byte 0</strong> indicates the type of the address. These are the
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possible values for this bit: <ul><li>0: The address is a universally administered address. Because this bit
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is 0, the burned-in address cannot be greater than <span>X'7FFFFFFFFFFF'</span>.</li>
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<li>1: The address is a locally administered address. Because this bit is
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1, the group address must be greater than <span>X'800000000000'</span>.</li>
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</ul>
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</li>
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</ul>
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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="rzajutroubleshootingtokenring.htm" title="The server has tools to help you locate and resolve errors.">Troubleshoot token ring</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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