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    <title>FC IDs </title>
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<a name="wp1545066"> </a><h1 class="pTitle">
FC IDs

</h1>
<a name="wp1545067"> </a><p class="pBody">
When an N or NL port logs into a Cisco MDS 9000 Family switch, it is assigned an FC ID. By default, 
the persistent FC ID feature is enabled. If this feature is disabled, the following consequences apply:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1545068"> </a><li class="pSmartList1">An N or NL port logs into a Cisco MDS 9000 Family switch. The WWN of the requesting N or NL 
port and the assigned FC ID are retained and stored in a volatile cache. The contents of this volatile 
cache are not saved across reboots. 
</li>
<a name="wp1545069"> </a><li class="pSmartList1">The switch is designed to preserve the binding FC ID to the WWN on a best-effort basis. For 
example, if one N port disconnects from the switch and its FC ID is requested by another device, 
this request is granted and the WWN with the initial FC ID association is released.
</li>
<a name="wp1545070"> </a><li class="pSmartList1">The volatile cache stores up to 4000 entries of WWN to FC ID binding. If this cache is full, a new 
(more recent) entry overwrites the oldest entry in the cache. In this case, the corresponding WWN 
to FC ID association for the oldest entry is lost.
</li>
<a name="wp1545071"> </a><li class="pSmartList1">The switch connection behavior differs between N ports and NL ports:
</li>
<div class="pSmartList2"><ul class="pSmartList2">
<a name="wp1545072"> </a><li class="pSmartList2">N ports receive the same FC IDs if disconnected and reconnected to any port within the same switch (as long as it belongs to the same VSAN).</li>
<a name="wp1545073"> </a><li class="pSmartList2">NL ports receive the same FC IDs only if connected back to the same port on the switch to which they were originally connected.</li>
</ul></div>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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