76 lines
5.0 KiB
HTML
76 lines
5.0 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="concept" />
|
|
<meta name="DC.Title" content="Auto-negotiation" />
|
|
<meta name="abstract" content="Auto-negotiation is the preferred method of configuring your system's Ethernet connections." />
|
|
<meta name="description" content="Auto-negotiation is the preferred method of configuring your system's Ethernet connections." />
|
|
<meta name="DC.Relation" scheme="URI" content="rzajyethernetcapabilities.htm" />
|
|
<meta name="DC.Relation" scheme="URI" content="rzajyautosensing.htm" />
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1999, 2006" />
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1999, 2006" />
|
|
<meta name="DC.Format" content="XHTML" />
|
|
<meta name="DC.Identifier" content="rzajyautonegotiation" />
|
|
<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>Auto-negotiation</title>
|
|
</head>
|
|
<body id="rzajyautonegotiation"><a name="rzajyautonegotiation"><!-- --></a>
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|
<h1 class="topictitle1">Auto-negotiation</h1>
|
|
<div><p>Auto-negotiation is the preferred method of configuring your system's
|
|
Ethernet connections.</p>
|
|
<div class="p">It should always be tried first. In auto-negotiation, your system sends
|
|
out Ethernet link pulses seeking to transfer configuration data between your
|
|
server and its link partner. Each partner shares its supported values for
|
|
line speed and duplex mode, then finds the highest common value for each.
|
|
The highest values common to both partners are selected, in this order: <ul><li><img src="./delta.gif" alt="Start of change" />10 Gbps full duplex<sup>1</sup><img src="./deltaend.gif" alt="End of change" /></li>
|
|
<li><img src="./delta.gif" alt="Start of change" />1 Gbps full duplex<sup>2</sup><img src="./deltaend.gif" alt="End of change" /></li>
|
|
<li><img src="./delta.gif" alt="Start of change" />1 Gbps half duplex<sup>2</sup><img src="./deltaend.gif" alt="End of change" /></li>
|
|
<li>100 Mbps full duplex</li>
|
|
<li>100 Mbps half duplex</li>
|
|
<li>10 Mbps full duplex</li>
|
|
<li>10 Mbps half duplex</li>
|
|
</ul>
|
|
<div class="note"><span class="notetitle">Note:</span> <ol><li><img src="./delta.gif" alt="Start of change" />The fiber optic 10 Gigabit Ethernet adapter card can only
|
|
run either 10 Gbase-LR (long range) or 10 Gbase-SR (short range),
|
|
and full duplex. The fiber optic 10 Gigabit Ethernet adapter card does allow
|
|
auto-negotiation, but the only acceptable outcome is 10 Gbps, full duplex.<img src="./deltaend.gif" alt="End of change" /></li>
|
|
<li><img src="./delta.gif" alt="Start of change" />For Gigabit Ethernet, the line speed is negotiable only when
|
|
using the UTP card, since this card has 10/100/1000BASE-T and full or half
|
|
duplex capabilities. The fiber optic Gigabit Ethernet adapter card can only
|
|
run 1000BASE-SX and full duplex. The fiber optic Gigabit Ethernet adapter
|
|
card does allow auto-negotiation, but the only acceptable outcome from the
|
|
auto-negotiation is 1000 Mbps, full duplex.<img src="./deltaend.gif" alt="End of change" /></li>
|
|
</ol>
|
|
</div>
|
|
</div>
|
|
<p>Auto-negotiation allows your server and its link partner to quickly establish
|
|
a connection. However, both systems must support auto-negotiation. If the
|
|
link partner is not configured to auto-negotiate, the system will auto-sense
|
|
a workable line speed, but not the duplex mode. The server will use the default
|
|
setting of half-duplex. If this is not the correct duplex mode, you will experience
|
|
a duplex mismatch, at which point you must manually configure your server's
|
|
duplex mode to match that of its link partner.</p>
|
|
</div>
|
|
<div>
|
|
<div class="familylinks">
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajyethernetcapabilities.htm" title="Ethernet capabilities, such as line speed and duplex mode, can enhance your server's performance.">Ethernet capabilities</a></div>
|
|
</div>
|
|
<div class="relconcepts"><strong>Related concepts</strong><br />
|
|
<div><a href="rzajyautosensing.htm" title="If auto-negotiation fails, your server can match the line speed of its link partner.">Auto-sensing</a></div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |