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    <title>Port Security Activation </title>
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<a name="wp1073032"> </a><h1 class="pTitle">
Port Security Activation

</h1>
<a name="wp1073033"> </a><p class="pBody">
By default, the port security feature is not activated in any switch in the Cisco MDS 9000 Family.

</p>
<a name="wp1073034"> </a><p class="pBody">
By activating the port security feature, the following apply:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1073035"> </a><li class="pSmartList1">Auto-learning is also automatically enabled, which means:
</li>
<div class="pSmartList2"><ul class="pSmartList2">
<a name="wp1073036"> </a><li class="pSmartList2">From this  point, auto-learning happens only for the devices or interfaces that were not logged into the switch.</li>
<a name="wp1073037"> </a><li class="pSmartList2">You cannot activate the database until you disable auto-learning.</li>
</ul></div>
<a name="wp1073038"> </a><li class="pSmartList1">All the devices that are already logged in are learned and are added to the active database.
</li>
<a name="wp1073039"> </a><li class="pSmartList1">All entries in the configured database are copied to the active database.
</li>
</ul></div>
<a name="wp1073040"> </a><p class="pBody">
After the database is activated, subsequent device login is subject to the activated port bound WWN 
pairs, excluding the auto-learned entries. You must disable auto-learning before the auto-learned entries 
become activated.

</p>
<a name="wp1073041"> </a><p class="pBody">
When you activate the port security feature, auto-learning is also automatically enabled. You can choose 
to activate the port security feature and disable auto-learning.

</p>
<a name="wp1073042"> </a><p class="pBodyAutonumRel">
<strong>Tip	&nbsp;&nbsp;&nbsp;</strong> If a port is shut down because of a denied login attempt, and you subsequently configure the database to 
allow that login, the port does not come up automatically. You must explicitly issue a <span style="font-weight: bold">no shutdown</span> CLI 
command to bring that port back online.

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

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