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    <title>TL Port ALPA Caches </title>
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<a name="wp1074253"> </a><h1 class="pTitle">
TL Port ALPA Caches

</h1>
<a name="wp1074254"> </a><p class="pBody">
Although TL ports cannot be automatically configured, you can manually configure entries in arbitrated 
loop physical address (ALPA) caches. Generally, ALPA cache entries are automatically populated when 
an ALPA is assigned to a device. Each device is identified by its port world wide name (pWWN). When 
a device is allocated an ALPA, an entry for that device is automatically created in the ALPA cache. 

</p>
<a name="wp1162525"> </a><p class="pBody">
A cache contains entries for recently allocated ALPA values. These caches are maintained on various TL 
ports. If a device already has an ALPA, the Cisco NX-OS software attempts to allocate the same ALPA 
to the device each time. The ALPA cache is maintained in persistent storage and saves information across 
switch reboots. The maximum cache size is 1000 entries. If the cache is full, and a new ALPA is 
allocated, the Cisco NX-OS software discards an inactive cache entry (if available) to make space for 
the new entry. See the <a href="intf09.html">&quot;TL Port&quot; topic</a> for more information on TL ports.

</p>
<a name="wp1192023"> </a><p class="pBody">
 Refer to the <span style="font-style: italic">Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide</span> to manage the TL Port 
ALPA cache.

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

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