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<a name="wp1093883"> </a><h1 class="pTitle">
About Cloud Discovery

</h1>
<a name="wp1093884"> </a><p class="pBody">
When an iSNS server receives a query request, it responds with a list of available targets and the portals 
through which the initiator can reach the target. The IP network configuration outside the MDS switch 
may result in only a subset of Gigabit Ethernet interfaces being reachable from the initiator. To ensure 
that the set of portals returned to the initiator is reachable, the iSNS server needs to know the set of 
Gigabit Ethernet interfaces that are reachable from a given initiator. 

</p>
<a name="wp1093885"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> iSNS Cloud Discovery is not supported on the Cisco Fabric Switch for IBM BladeCenter and Cisco 
Fabric Switch for HP c-Class BladeSystem.

</p>
<a name="wp1093886"> </a><p class="pBody">
The iSNS cloud discovery feature provides information to the iSNS server on the various interfaces 
reachable from an initiator by partitioning the interfaces on a switch into disjointed IP clouds. This 
discovery is achieved by sending messages to all other known IPS ports that are currently up and, 
depending on the response (or the lack of it), determines if the remote IPS port is in the same IP network 
or in a different IP network.

</p>
<a name="wp1093887"> </a><p class="pBody">
Cloud discovery is initiated when the following events occur:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1093888"> </a><li class="pSmartList1">Manual requests from the CLI initiate cloud discovery from the CLI. This action causes the 
destruction of existing memberships and makes new ones.
</li>
<a name="wp1093889"> </a><li class="pSmartList1">Auto-discovery of the interface results in an interface being assigned to its correct cloud. All other 
cloud members are not affected. The membership of each cloud is built incrementally and is initiated 
by the following events:
</li>
<div class="pSmartList2"><ul class="pSmartList2">
<a name="wp1093890"> </a><li class="pSmartList2">A Gigabit Ethernet interface comes up. This can be a local or remote Gigabit Ethernet interface. </li>
<a name="wp1093891"> </a><li class="pSmartList2">The IP address of a Gigabit Ethernet interface changes.</li>
<a name="wp1093892"> </a><li class="pSmartList2">The VRRP configuration on a port changes.</li>
</ul></div>
</ul></div>
<a name="wp1093893"> </a><p class="pBody">
The iSNS server distributes cloud and membership information across all the switches using CFS. 
Therefore, the cloud membership view is the same on all the switches in the fabric.

</p>
<a name="wp1093894"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> For CFS distribution to operate correctly for iSNS cloud discovery, all switches in the fabric must be 
running Cisco SAN-OS Release 3.0(1) or NX-OS 4.1(1b) and later.

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

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