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    <title>About Auto-Learning </title>
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<a name="wp1073023"> </a><h1 class="pTitle">
About Auto-Learning

</h1>
<a name="wp1073024"> </a><p class="pBody">
You can instruct the switch to automatically learn (auto-learn) the port security configurations over a 
specified period. This feature allows any switch in the Cisco MDS 9000 Family to automatically learn 
about devices and switches that connect to it. Use this feature when you activate the port security feature 
for the first time as it saves tedious manual configuration for each port. You must configure auto-learning 
on a per-VSAN basis. If enabled, devices and switches that are allowed to connect to the switch are 
automatically learned, even if you have not configured any port access. 

</p>
<a name="wp1073025"> </a><p class="pBody">
When auto-learning is enabled, learning happens only for the devices or interfaces that were not already 
logged into the switch. Learned entries on a port are cleaned up after you shut down that port if 
auto-learning is still enabled.

</p>
<a name="wp1073026"> </a><p class="pBody">
Learning does not override the existing configured port security policies. So, for example, if an interface 
is configured to allow a specific pWWN, then auto-learning will not add a new entry to allow any other 
pWWN on that interface. All other pWWNs will be blocked even in auto-learning mode.

</p>
<a name="wp1073027"> </a><p class="pBody">
No entries are learned for a port in the shutdown state.

</p>
<a name="wp1073028"> </a><p class="pBody">
When you activate the port security feature, auto-learning is also automatically enabled.

</p>
<a name="wp1073029"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> If you enable auto-learning before activating port security, you cannot activate until auto-learning is 
disabled.

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

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