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    <title>About DHCHAP Authentication Modes </title>
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<a name="wp1072985"> </a><h1 class="pTitle">
About DHCHAP Authentication Modes

</h1>
<a name="wp1072986"> </a><p class="pBody">
The DHCHAP authentication status for each interface depends on the configured DHCHAP port mode. 

</p>
<a name="wp1072987"> </a><p class="pBody">
When the DHCHAP feature is enabled in a switch, each Fibre Channel interface or FCIP interface may 
be configured to be in one of four DHCHAP port modes:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1072988"> </a><li class="pSmartList1">On&#8212;During switch initialization, if the connecting device supports DHCHAP authentication, the 
software performs the authentication sequence. If the connecting device does not support DHCHAP 
authentication, the software moves the link to an isolated state.
</li>
<a name="wp1072989"> </a><li class="pSmartList1">Auto-Active&#8212;During switch initialization, if the connecting device supports DHCHAP 
authentication, the software performs the authentication sequence. If the connecting device does not 
support DHCHAP authentication, the software continues with the rest of the initialization sequence. 
</li>
<a name="wp1072990"> </a><li class="pSmartList1">Auto-Passive (default)&#8212;The switch does not initiate DHCHAP authentication, but participates in 
DHCHAP authentication if the connecting device initiates DHCHAP authentication.
</li>
<a name="wp1072991"> </a><li class="pSmartList1">Off&#8212;The switch does not support DHCHAP authentication. Authentication messages sent to such 
ports return error messages to the initiating switch.
</li>
</ul></div>
<a name="wp1072992"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Whenever DHCHAP port mode is changed to a mode other than the Off mode, reauthentication is 
performed.

</p>
<a name="wp1072996"> </a><p class="pBody">
<a href="fcspdh06.html#wp1073000">Table&#160;32-1</a> identifies the switch-to-switch authentication behavior between two Cisco MDS switches in 
various modes.

</p>
<a name="wp1073070"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1073000table1072997">
  <caption><a name="wp1073000"> </a><div class="pTableTitle">
Table&#160;32-1	DHCHAP Authentication Status Between Two MDS Switches

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th colspan="1" rowspan="2"><a name="wp1073010"> </a><p class="pCellHeading">
Switch N

</p>
<a name="wp1073011"> </a><p class="pCellHeading">
DHCHAP 
Modes

</p>
</th>
    <th colspan="4" rowspan="1"><a name="wp1073013"> </a><p class="pCellHeading">
Switch 1 DHCHAP Modes

</p>
</th>
</tr>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1073023"> </a><p class="pCellHeading">
on

</p>
</th>
    <th><a name="wp1073025"> </a><p class="pCellHeading">
auto-active 

</p>
</th>
    <th><a name="wp1073027"> </a><p class="pCellHeading">
auto-passive 

</p>
</th>
    <th><a name="wp1073029"> </a><p class="pCellHeading">
off

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073031"> </a><p class="pCellHeading">
on

</p>
</td>
    <td colspan="1" rowspan="3"><a name="wp1073033"> </a><p class="pBody">
FC-SP 
authentication is 
performed.

</p>
</td>
    <td colspan="1" rowspan="3"><a name="wp1073035"> </a><p class="pBody">
FC-SP authentication 
is performed.

</p>
</td>
    <td colspan="1" rowspan="2"><a name="wp1073037"> </a><p class="pBody">
FC-SP authentication 
is performed.

</p>
</td>
    <td><a name="wp1073039"> </a><p class="pBody">
Link is brought 
down.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073041"> </a><p class="pCellHeading">
auto-Active 

</p>
</td>
    <td colspan="1" rowspan="2"><a name="wp1073049"> </a><p class="pBody">
FC-SP 
authentication is 
<em class="cEmphasis">not </em>performed.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073051"> </a><p class="pCellHeading">
auto-Passive 

</p>
</td>
    <td><a name="wp1073057"> </a><p class="pBody">
FC-SP authentication 
is <em class="cEmphasis">not </em>performed.

</p>
</td>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1073061"> </a><p class="pCellHeading">
off

</p>
</td>
    <td><a name="wp1073063"> </a><p class="pBody">
Link is brought 
down.

</p>
</td>
    <td colspan="3" rowspan="1"><a name="wp1073065"> </a><p class="pBody">
FC-SP authentication is <em class="cEmphasis">not </em>performed.

</p>
</td>
</tr>
</table>
</div>
<p class="pBodyRelative">
</p>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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