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    <title>Information About Fibre Channel Domains </title>
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<a name="wp1536669"> </a><h1 class="pTitle">
Information About Fibre Channel Domains

</h1>
<a name="wp1536671"> </a><p class="pBody">
The Fibre Channel domain (fcdomain) feature performs principal switch selection, domain ID 
distribution, FC ID allocation, and fabric reconfiguration functions as described in the FC-SW-2 
standards. The domains are configured on a per VSAN basis. If you do not configure a domain ID, the 
local switch uses a random ID.

</p>
<a name="wp1355080"> </a><p class="pBody">
This section describes each fcdomain phase:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1355081"> </a><li class="pSmartList1">Principal switch selection&#8212;This phase guarantees the selection of a unique principal switch across 
the fabric.
</li>
<a name="wp1355083"> </a><li class="pSmartList1">Domain ID distribution&#8212;This phase guarantees each switch in the fabric obtains a unique domain 
ID.
</li>
<a name="wp1355085"> </a><li class="pSmartList1">FC ID allocation&#8212;This phase guarantees a unique FC ID assignment to each device attached to the 
corresponding switch in the fabric.
</li>
<a name="wp1355087"> </a><li class="pSmartList1">Fabric reconfiguration&#8212;This phase guarantees a resynchronization of all switches in the fabric to 
ensure they simultaneously restart a new principal switch selection phase.
</li>
<a name="wp1536973"> </a><p class="pCaution">
<table border="0">
<tr>
<td>
<strong>Caution	&nbsp;&nbsp;&nbsp;</strong>
</td>
<td>
<p>Changes to fcdomain parameters should not be performed on a daily basis. These changes should be 
made by an administrator or individual who is completely familiar with switch operations.
</p>
</td>
</tr>
</table>

</p>
</ul></div>
<a name="wp1548893"> </a><p class="pBody">


</p>
<a name="wp1548899"> </a><p class="pBody">
This section includes the following topics:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1549016"> </a><li class="pSmartList1"><a href="domn03.html">Domain Restart</a>
</li>
<a name="wp1549060"> </a><li class="pSmartList1"><a href="domn04.html">Domain Manager Fast Restart</a>
</li>
<a name="wp1549089"> </a><li class="pSmartList1"><a href="domn05.html">Switch Priority</a>
</li>
<a name="wp1549118"> </a><li class="pSmartList1"><a href="domn06.html">fcdomain Initiation</a>
</li>
<a name="wp1549147"> </a><li class="pSmartList1"><a href="domn07.html">Incoming RCFs</a>
</li>
<a name="wp1549168"> </a><li class="pSmartList1"><a href="domn08.html">Autoreconfiguring Merged Fabrics</a>
</li>
<a name="wp1549189"> </a><li class="pSmartList1"><a href="domn09.html">Domain IDs</a>
</li>
<a name="wp1549210"> </a><li class="pSmartList1"><a href="domn14.html">Locking the Fabric</a>
</li>
<a name="wp1549226"> </a><li class="pSmartList1"><a href="domn15.html">Committing Changes</a>
</li>
<a name="wp1549230"> </a><li class="pSmartList1"><a href="domn16.html">Clearing a Fabric Lock</a>
</li>
<a name="wp1549235"> </a><li class="pSmartList1"><a href="domn17.html">FC IDs</a>
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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