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    <title>Configuring SPAN max-queued-packets </title>
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<a name="wp1416630"> </a><h1 class="pTitle">
Configuring SPAN max-queued-packets

</h1>
<a name="wp1416631"> </a><p class="pBody">
When a SPAN destination port is oversubscribed or has more source traffic than the speed of the 
destination port, the source ports of the SPAN session will reduce in their throughput. The impact is 
proportional to the amount of source traffic flowing in. Lowering the max-queued-packets value from 
the default value of 15 to 1 prevents the impact on the source ports. It is necessary to reconsider the 
default value for this setting as it may impact the source interface throughput.

</p>
<a name="wp1518619"> </a><h2 class="pHeading2">
Restrictions
</h2>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1470334"> </a><li class="pSmartList1">The span max-queued-packets can be changed only if no SPAN sessions are currently active on the 
switch.
</li>
<a name="wp1480754"> </a><li class="pSmartList1">If you are spanning the traffic going through an FCIP interface, SPAN copies may be dropped even 
if the SD interface has more bandwidth than the amount of traffic being replicated. To avoid SPAN 
drops, set the max-queued-packets to a higher value; for example, 100.
</li>
</ul></div>
<a name="wp1470322"> </a><p class="pBody">
By default, SPAN frames are dropped if the sum of the bandwidth of the source interfaces exceed the 
bandwidth of the destination port. With a higher value, the SPAN traffic has a higher probability of 
reaching the SPAN destination port instead of being dropped at the expense of data traffic throughput.

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

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