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    <title>Information About DPVM </title>
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<a name="wp1056837"> </a><h1 class="pTitle">
Information About DPVM

</h1>
<a name="wp1072514"> </a><p class="pBody">
Port VSAN membership on the switch is assigned on a port-by-port basis. By default each port belongs 
to the default VSAN. 

</p>
<a name="wp1072515"> </a><p class="pBody">
You can dynamically assign VSAN membership to ports by assigning VSANs based on the device 
WWN. This method is referred to as Dynamic Port VSAN Membership (DPVM). DPVM offers 
flexibility and eliminates the need to reconfigure the port VSAN membership to maintain fabric 
topology when a host or storage device connection is moved between two Cisco MDS 9000 family 
switches or two ports within a switch. It retains the configured VSAN regardless of where a device is 
connected or moved. To assign VSANs statically, see <a href="vsan01.html">&quot;Configuring and Managing VSANs.&quot;</a> 

</p>
<a name="wp1072527"> </a><p class="pBody">
DPVM configurations are based on port world wide name (pWWN) and node world wide name (nWWN) 
assignments. A DPVM database contains mapping information for each device pWWN/nWWN 
assignment and the corresponding VSAN. The Cisco NX-OS software checks the database during a 
device FLOGI and obtains the required VSAN details.

</p>
<a name="wp1072528"> </a><p class="pBody">
The pWWN identifies the host or device and the nWWN identifies a node consisting of multiple devices. 
You can assign any one of these identifiers or any combination of these identifiers to configure DPVM 
mapping. If you assign a combination, then preference is given to the pWWN.

</p>
<a name="wp1072529"> </a><p class="pBody">
DPVM uses the Cisco Fabric Services (CFS) infrastructure to allow efficient database management and 
distribution. DPVM uses the application driven, coordinated distribution mode and the fabric-wide 
distribution scope (for information about CFS, refer to the <em class="cEmphasis">Cisco MDS 9000 Family NX-OS System 
Management Configuration Guide</em>.

</p>
<a name="wp1072562"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> DPVM does not cause any changes to device addressing. DPVM only pertains to the VSAN membership 
of the device, ensuring that the host gets the same VSAN membership on any port on the switch. For 
example, if a port on the switch has a hardware failure, you can move the host connection to another port 
on the switch and you do not need to update the VSAN membership manually.

</p>
<a name="wp1072563"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> DPVM is not supported on FL ports. DPVM is supported only on F ports.

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1074725"> </a><li class="pSmartList1"><a href="dpvm03.html">About DPVM Configuration</a>
</li>
<a name="wp1074734"> </a><li class="pSmartList1"><a href="dpvm04.html">About DPVM Databases</a>
</li>
<a name="wp1074739"> </a><li class="pSmartList1"><a href="dpvm05.html">About Autolearned Entries</a>
</li>
<a name="wp1074755"> </a><li class="pSmartList1"><a href="dpvm06.html">About DPVM Database Distribution</a>
</li>
<a name="wp1074760"> </a><li class="pSmartList1"><a href="dpvm07.html">About Locking the Fabric</a>
</li>
<a name="wp1074777"> </a><li class="pSmartList1"><a href="dpvm08.html">About Copying DPVM Databases</a>
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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