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    <title>About Overlay VSANs </title>
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<a name="wp1074299"> </a><h1 class="pTitle">
About Overlay VSANs

</h1>
<a name="wp1074300"> </a><p class="pBody">
VSANs enable deployment of larger SANs by overlaying multiple logical SANs, each running its own 
instance of fabric services, on a single large physical network. This partitioning of fabric services 
reduces network instability by containing fabric reconfiguration and error conditions within an 
individual VSAN. VSANs also provide the same isolation between individual VSANs as physically 
separated SANs. Traffic cannot cross VSAN boundaries and devices may not reside in more than one 
VSAN. Because each VSAN runs separate instances of fabric services, each VSAN has its own zone 
server and can be zoned in exactly the same way as SANs without VSAN capability.

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

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