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<a name="wp1489114"> </a><h1 class="pTitle">
Guidelines and Limitations

</h1>
<a name="wp1498474"> </a><h1 class="pTitle">
SPAN Configuration Guidelines

</h1>
<a name="wp1489115"> </a><p class="pBody">
The following guidelines and limitations apply for SPAN configurations: 

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1489116"> </a><li class="pSmartList1">You can configure up to 16 SPAN sessions with multiple ingress (Rx) sources.
</li>
<a name="wp1489117"> </a><li class="pSmartList1">You can configure a maximum of three SPAN sessions with one egress (Tx) port.
</li>
<a name="wp1489119"> </a><li class="pSmartList1">In a 32-port switching module, you must configure the same session in all four ports in one port 
group (unit). If you wish, you can also configure only two or three ports in this unit.
</li>
<a name="wp1489120"> </a><li class="pSmartList1">SPAN frames are dropped if the sum of the bandwidth of the sources exceeds the speed of the 
destination port. 
</li>
<a name="wp1489121"> </a><li class="pSmartList1">Frames dropped by a source port are not spanned.
</li>
<a name="wp1548240"> </a><li class="pSmartList1">SPAN does not capture pause frames in a Fibre Channel over Ethernet (FCoE) network because 
pause frames sent from the virtual expansion (VE) port are generated and terminated by the 
outermost MAC layer. For more information on FCoE, see the <span style="font-style: italic">Cisco NX-OS FCoE Configuration 
Guide for Cisco Nexus 7000 and Cisco MDS 9500</span>.
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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