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    <title>Key Concepts </title>
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<a name="wp1072513"> </a><h1 class="pTitle">
Key Concepts

</h1>
<a name="wp1072515"> </a><p class="pBody">
The trunking feature includes the following key concepts:

</p>
<div class="pSmartList1"><ul class="pSmartList1">
<a name="wp1072516"> </a><li class="pSmartList1">TE port&#8212;If trunk mode is enabled in an E port and that port becomes operational as a trunking E 
port, it is referred to as a TE port.
</li>
<a name="wp1072521"> </a><li class="pSmartList1">TF port&#8212;If trunk mode is enabled in an F port and that port becomes operational as a trunking F 
port, it is referred to as a TF port.
</li>
<a name="wp1072522"> </a><li class="pSmartList1">TN port&#8212;If trunk mode is enabled (not currently supported) in an N port and that port becomes 
operational as a trunking N port, it is referred to as a TN port.
</li>
<a name="wp1072529"> </a><li class="pSmartList1">TNP port&#8212;If trunk mode is enabled in an NP portand that port becomes operational as a trunking 
NP port, it is referred to as a TNP port.
</li>
<a name="wp1072533"> </a><li class="pSmartList1">TF PortChannel&#8212;If trunk mode is enabled in an F PortChannel  and that PortChannel becomes 
operational as a trunking F PortChannel, it is referred to as TF PortChannel. Cisco Port Trunking 
Protocol (PTP) is used to carry tagged frames.
</li>
<a name="wp1072534"> </a><li class="pSmartList1">TF-TN port link&#8212;A single link can be established to connect an F port to an HBA to carry tagged 
frames using Exchange Virtual Fabrics Protocol (EVFP). A server can reach multiple VSANs 
through a TF port without inter-VSAN routing (IVR).
</li>
<a name="wp1072538"> </a><li class="pSmartList1">TF-TNP port link&#8212;A single link can be established to connect an TF port to an TNP port using the 
PTP protocol to carry tagged frames . PTP is used because PTP also supports trunking PortChannels.
</li>
<a name="wp1072542"> </a><p class="pBodyAutonumRel">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> The TF-TNP port link between a third-party NPV core and a Cisco NPV switch is 
established using the EVFP protocol.

</p>
<a name="wp1072543"> </a><li class="pSmartList1">A Fibre Channel VSAN is called Virtual Fabric and uses a VF_ID in place of the VSAN ID. By 
default, the VF_ID is 1 for all ports. When an N port supports trunking, a pWWN is defined for each 
VSAN and called a logical pWWN. In the case of MDS core switches, the pWWNs for which the N 
port requests additional FC_IDs are called virtual pWWNs.
</li>
</ul></div>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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