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    <title>Configuring SPAN for Generation 2 Fabric Switches </title>
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<a name="wp1431355"> </a><h1 class="pTitle">
Configuring SPAN for Generation 2 Fabric Switches

</h1>
<a name="wp1431356"> </a><p class="pBody">
Cisco Generation 2 fabric switches (such as MDS 9124) support SPAN sessions in both directions, Rx 
and Tx.

</p>
<a name="wp1431357"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> While using Generation 2 fabric switches, you cannot create an additional active SPAN session when 
you already have one.

</p>
<a name="wp1518714"> </a><h2 class="pHeading2">
Restrictions
</h2>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1483076"> </a><li class="pSmartList1">You can specify multiple SPAN source interfaces in Rx and Tx directions. 
</li>
<a name="wp1483077"> </a><li class="pSmartList1">You cannot mix ingress and egress interfaces in the same SPAN session. The SPAN will reject any 
configuration that mixes Rx ad Tx directions. However, you can specify multiple SPAN source 
interfaces in a single direction.
</li>
</ul></div>
<a name="wp1486298"> </a><p class="pBody">
Generation 2 Fabric Switches support VSAN filters for one VSAN only in the egress direction; this 
restriction does not apply to the ingress direction. For example, if you have an interface that is a TE port, 
with an active VSAN of 1 to 5, and you specify a VSAN filter for VSAN 2, then only the traffic on VSAN 
2 will be filtered. 

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

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