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    <title>Performing Internal Loopback Tests </title>
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<a name="wp1195879"> </a><h1 class="pTitle">
Performing Internal Loopback Tests

</h1>
<a name="wp1195880"> </a><p class="pBody">
You can run manual loopback tests to identify hardware errors in the data path in the switching or 
services modules, and the control path in the supervisor modules. Internal loopback tests send and 
receive FC2 frames to and from the same ports and provide the round-trip time taken in microseconds. 
These tests are available for Fibre Channel, IPS, and iSCSI interfaces.

</p>
<a name="wp1377309"> </a><p class="pBody">
Choose <span style="font-weight: bold">Interface</span> &gt; <span style="font-weight: bold">Diagnostics</span> &gt; <span style="font-weight: bold">Internal</span> to perform an internal loopback test from Device Manager.

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

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